[PATCH V2 3/5] nvme: don't abort completed request in nvme_cancel_request

[Ming Lei <ming.lei@redhat.com>]

Before aborting in-flight requests, all IO queues and their interrupts
have been shutdown. However, request's completion function may not be
done yet because it can be scheduled to run via IPI.

So don't abort one request if it is marked as completed, otherwise
we may abort one normal completed request.

Cc: Max Gurtovoy <maxg@mellanox.com>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
 drivers/nvme/host/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index cc09b81fc7f4..e98490b98cbd 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -288,6 +288,10 @@ bool nvme_cancel_request(struct request *req, void *data, bool reserved)
 	dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device,
 				"Cancelling I/O %d", req->tag);
 
+	/* don't abort one completed request */
+	if (blk_mq_request_completed(req))
+		return true;
+
 	nvme_req(req)->status = NVME_SC_ABORT_REQ;
 	blk_mq_complete_request_sync(req);
 	return true;
-- 
2.20.1